The animal group that is not found in marine water:

• Mammals
• Amphibia
• Reptiles
• Aves
Correct Option: D  [ Aves ]

Remark:

The most abundant metal in the Earth crust is:

• zinc
• copper
• aluminium
• iron
Correct Option: C  [ aluminium ]

Remark:

Which of the following compounds is used in fire extinguishers ?

• Sodium carbonate
• Sodium bicarbonate
• Sodium nitrate
• Sodium sulphate
Correct Option: B  [ Sodium bicarbonate ]

Remark:

Which cells in our body are popularly called 'soldiers' of the human body?

• Eosinophils
• White blood cells
• Red blood cells
• Basophils
Correct Option: B  [ White blood cells ]

Remark:

Which of the following is the heaviest ?

• Proton
• Electron
• Neutron
• Neutrino
Correct Option: A  [ Proton ]

Remark:

Time during which a job is processed by the computer is:

• Delay time
• Real time
• Down time
• Execution time
Correct Option: D  [ Execution time ]

Remark:

Silviculture is the management of :

• Rivers
• Lakes
• Hills
• Forests
Correct Option: D  [ Forests ]

Remark:

Sericuluture is a rearing practice of :

• Fishes
• Silk worm
• Honey bees
• Earth worm
Correct Option: B  [ Silk worm ]

Remark:

Hydro?uoric acid is not kept in glass bottles because it reacts with:

• visible light
• sodium oxide of glass
• aluminium oxide of glass
• silicon dioxide of glass
Correct Option: D  [ silicon dioxide of glass ]

Remark:

Alcohol contains :

• nitrogen, hydrogen, oxygen
• carbon, hydrogen, oxygen
• oxygen, carbon, nitrogen
• hydrogen, chlorine, oxygen
Correct Option: B  [ carbon, hydrogen, oxygen ]

Remark: